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Evolution of micro-pores in a single crystal nickel-based superalloy during 980 °C creep

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Acta Metallurgica Sinica (English Letters) Aims and scope

Abstract

The evolution of micro-pores in a single crystal nickel-based superalloy during creep at 980 °C/220 MPa was investigated by X-ray computed tomography. Time-dependent ex-situ 3D information including the number, volume fraction, distribution and morphology of micro-pores was analyzed. The results reveal that the significant formation and growth of micro-pores occur at the end of secondary/beginning of tertiary creep stage. The irregular large pores as well as high density pores located at strain concentration region are the major detrimental factors facilitating the creep damage. Creep failure is resulted from the connection of surface cracks induced by oxidation, and the internal cracks generated from growth and merging of micro-pores.

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Data Availability Statement

All the data discussed are directly presented in the paper and therefore they are automatically accessible

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Acknowledgements

This work was financially supported by the National Natural Science Foundation of China (Grant Nos. 51631008, 91860201, 51771204, 51911530154 and U1732131), the National Science and Technology Major Project (2017-VII-0008-0101, 2017-VI-0003-0073 and J2019-VI-0010) and the Key Deployment Projects of the Chinese Academy of Sciences (ZDRW-CN-2019-01). The authors were also grateful to Yan Wang for the assistance in creep experiments.

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Authors and Affiliations

  1. Superalloys Division, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Yufeng He, Jian Shen, Dong Wang, Yuzhang Lu, Langhong Lou & Jian Zhang

  2. School of Materials Science and Engineering, University of Science and Technology of China, Shenyang, 110016, China

    Yufeng He

  3. Shenyang National Laboratory for Materials Science, Institute of Metal Research, Chinese Academy of Sciences, Shenyang, 110016, China

    Shaogang Wang

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  1. Yufeng He
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Correspondence to Jian Shen or Jian Zhang.

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He, Y., Wang, S., Shen, J. et al. Evolution of micro-pores in a single crystal nickel-based superalloy during 980 °C creep. Acta Metall. Sin. (Engl. Lett.) 35, 1397–1406 (2022). https://doi.org/10.1007/s40195-021-01371-6

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  • DOI: https://doi.org/10.1007/s40195-021-01371-6

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